Babies whose mothers had exercised tended to perform better on tests of motor skills. Newborns whose mothers exercise during pregnancy may become physically coordinated a little earlier than other babies, according to a captivating new study of gestation, jogging and the varying ability of tiny infants to make a fist. The study’s findings add to growing evidence that physical activity during pregnancy can strengthen not just the mother but also her unborn children and might influence how well and willingly those children later move on their own.

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